Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
권호 표지

Fate of Genetically Engineered 2,4-D-Degrading Microorganisms in Natural Soils and Waters

  • Hong, Seok-Myeong (Department of Agricultural Biology, Seoul National University) ;
  • Lee, Yin-Won (Department of Agricultural Biology, Seoul National University) ;
  • Kim, Chi-Kyung (Department of Microbiology, Chungbuk National University) ;
  • Ka, Jong-Ok (Department of Agricultural Biology, Seoul National University)
  • Published : 1996.12.01
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Abstract

To analyze the effects of host versus plasmid on survival of 2, 4-degrading bacteria in environmental samples, strains Pseudomonas cepacia/pJP4, Alcaligenes JMP228/pJP4, P. cepacia/p712, and Alcaligenes JMP228/p712 were separately inoculated into samples of field soil, paddy soil, lake water, and river water, and then the changes of their populations were measured. The strains used contained a 2, 4-D degradative plasmid, either pJP4 conferring fast-growing property to the host or p712 conferring slow-growing property, and were resistant to antibiotics such that the inoculated strains could be enumerated against the indigenous microbial populations. In sterile environmental samples, these strains were stably maintained at the levels used for inoculation, except in sterile paddy soil where Alcaligenes JMP228 strains died drapidly. In natural soil samples for four strains declined steadily with time, but in naturla water samples their polulations fell rapidly at the early phase and then remained almost constant. When the environmentla samples were treated with 2, 4-D, P. cepacia/pJP4 and P. cepacia/p712 maintained significant numbers, while Alcaligenes JMP228/pJP4 and Alcaligenes JMP228/p712 declined significantly in most of the samples. The results indicated that the survivability of genetically modified microorganisms could vary depending on the environments and that their abundance in the environments under s2, 4-D selection was markedly influenced by the nature of the 2, 4-D degradative plasmid as well as type of the host strain.

Keywords

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